Pedosphere 29(6): 730--739, 2019
ISSN 1002-0160/CN 32-1315/P
©2019 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of Water Quality on Heavy Metal Redistribution and Mobility in Polluted Agricultural Soils in a Semi-Arid Region |
Rim AZOUZI1, Abdelkrim CHAREF1 , Lamia AYED2, Samia KHADHAR2 |
1Laboratoire Géoressources, Centre des Recherches et Technologies des Eaux, Soliman 8020(Tunisia)
2Laboratoire d'Analyse, Traitement et Valorisation des Polluants de l'Environnement et des Produits, Facultéde Pharmacie, Rue Avicenne, Monastir 5000(Tunisia) |
| ABSTRACT |
| Mornag Plain is a coastal area of the Mediterranean basin, which has undergone an agricultural industrial boom. The aim of this study was to investigate the different water qualities used for irrigation on heavy metal mobility in these polluted agricultural soils. The geo-accumulation indices for heavy metals (Ni, Cr, Pb, Cd, Cu, and Zn) revealed that industrial activities and used treated wastewater (TWW) contributed to soil pollution, and water irrigation always decreased this contamination. After long-term use of different water types, high perturbation of heavy metal redistribution has occurred. Groundwater use altered all heavy metal redistributions in the irrigated soil among various soil-solid and soil-solution fractions, as compared to the unirrigated soil. Slight acid water use transferred some metals from different solid phase components into water-soluble and exchangeable fractions. However, TWW use transformed some Ni, Cr, Cd, Cu, and Zn from water-soluble and exchangeable fractions to less labile fractions, particularly into organically bound fractions. Reuse of conventional water within the same soil decreased the whole soil redistribution index values, indicating tendency to return to the pattern of distribution of groundwater-irrigated soil. |
| Key Words: exchangeable fraction,geo-accumulation index,labile fraction,mobility factor,organically bound fraction,redistribution index,treated wastewater,water-soluble fraction |
| Citation: Azouzi R, Charef A, Ayed L, Khadhar S. 2019. Effect of water quality on heavy metal redistribution and mobility in polluted agricultural soils in a semi-arid region. Pedosphere. 29(6):730-739. |
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